Magnetotransport properties of Mo substituted La0.7Ca0.3Mn1−xMoxO3 perovskites

• Transport and magnetic properties of La0.7Ca0.3Mn1−xMoxO3 were investigated.
• Step growth structure, particle size and the morphology changes with TA and x.
• Both TMI and TC decreases monotonically with increasing x and increasing TA.
• FM ordering persists in all samples and the Ms decreases linearly as x increases.
• The results are ascribed to the opening of FM coupling between Mn2+–O–Mn3+.

We studied the effects of Mo substitution on the structural, transport, and magnetic properties of the La0.7Ca0.3Mn1−xMoxO3 (x ≤ 0.1) samples. Powder X-ray diffraction analysis reveals that the samples studied crystallize in the orthorhombic structure with space group Pbnm. Both particle size and morphology change significantly as the Mo content x varies. The metal-insulator transition temperature (TMI) and Curie temperature (TC) decrease monotonically as x increases. Magnetization data reveal that long-range FM ordering persists in all samples and the saturation moment decreases linearly as x increases. The smaller depression rate of dTC/dx observed is mainly ascribed to the increased amount of Mn2+ ions with Mo doping, which opens the FM coupling between Mn2+–O–Mn3+ in the samples.

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